Exhaust Gas Recirculation (EGR) Coolant Temperature

The EGR cooler is supposed to keep the exhaust gases cool before they re-enter the engine. If the coolant temp is too high or low, it means the cooler might not be working right or there's a coolant issue.

The engine control module monitors the temperature of the EGR cooler coolant. If the temperature is outside the normal operating range, usually around 120-180°F (49-82°C), the system triggers the fault code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the coolant level in the system; ensure it's at the manufacturer's specified level. Decision point: Is the coolant level low? Yes: Refill coolant and retest. No: Proceed to step 2.
2. 22. Inspect wiring and connectors to the EGR coolant temperature sensor for damage or corrosion. Decision point: Are the wires intact? Yes: Proceed to step 3. No: Repair or replace the damaged wiring.
3. 33. Use a scan tool to read the actual coolant temperature and compare it to the expected temperature values. Decision point: Is the temperature reading normal? Yes: Proceed to step 4. No: Replace the coolant temperature sensor.
4. 44. Check the EGR cooler for clogs by performing a visual inspection or checking for proper operation. Decision point: Is the EGR cooler functional? Yes: Further investigation may be needed in the engine system. No: Replace the EGR cooler.

• Coolant leaks in the EGR system
• EGR cooler blockage or failure
• Faulty temperature sensor
• Wiring issues or poor connections
• Low coolant level

$$